mRNA是细胞内RNA比例最高的一种,因为它与基因表达有关。()
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DNA的Tm值随(A+T)/(G+C)比值的增加而增加。()
A. 对
B. 错
mRNA上密码子为pCAG,则与之对应的tRNA上反密码子为pATG。()
A. 对
B. 错
He put the big box down on the floor, _______ (breathe) heavily and _________ (look) exhausted.
________ (consider) the importance of the experiment, they checked the result again and again.